Geochemical Characteristics of Upper Paleozoic Source Rocks in Xunyi Block, Ordos Basin
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摘要: 对鄂尔多斯南部旬宜区块上古生界烃源岩进行了系统性地分层系、分岩性的地球化学特征研究，为油气勘探提供了理论依据。通过对鄂尔多斯盆地南部旬宜区块内已有钻井岩心、岩屑、化验分析资料的整理分析，结合区域地质情况，对区块内烃源岩有机质丰度、类型、成熟度进行综合研究认为，有机质类型为Ⅲ型干酪根，成熟度总体上呈高熟-过熟，多数已进入过成熟干气阶段，太原组-山西组均具有良好的生烃潜力。同时，将碳质泥岩也纳入评价范畴，评价结果表明碳质泥岩具有一定的物质基础，进一步提升了本区的勘探潜力，丰富了整个盆地南部的烃源岩评价理论，对本区天然气勘探部署具有重要的指导意义。Abstract: This paper systematically studies the geochemical characteristics of the upper Paleozoic source rock which is in Xunyi block, south of ordos by stratification and lithology, providing theoretical basis for oil and gas exploration. Based on the sorting and analysis of the existing data of drilling cores, cuttings and chemical analysis in this area, a comprehensive study of degree, type and maturity of the organic matter of the source rocks is done considering the regional geological conditions. The results show that the organic matter type is the Ⅲ kerogen. The maturity is generally from high-mature to over-mature, the majority being over-mature dry gas. Both Taiyuan Formation and Shanxi formation have good hydrocarbon generating potential. The paper also brings carbonaceous mudstone into the evaluation category. The evaluation results show that carbonaceous mudstone has a certain material basis. It has promoted the exploration potential of this area, and enriched the hydrocarbon source rock evaluation theory in the south of the whole basin. It has an important guiding significance for the exploration and deployment of natural gas in this area.
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Key words:
- Ordos Basin /
- Upper Paleozoic /
- source rock /
- organic matter abundance /
- organic matter type /
- organic maturity
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